The mineral galena is composed of lead(II) sulfide and has

Chapter 3, Problem 22P

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QUESTION: Problem 22P

The mineral galena is composed of lead(II) sulfide and has an average density of 7.46 g/cm3 (a) How many moles of lead(II) sulfide are in 1.00 ft3 of galena? (b) How many lead atoms are in 1.00 dm3 of galena?

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QUESTION: Problem 22P

The mineral galena is composed of lead(II) sulfide and has an average density of 7.46 g/cm3 (a) How many moles of lead(II) sulfide are in 1.00 ft3 of galena? (b) How many lead atoms are in 1.00 dm3 of galena?

ANSWER:

Problem 22P

Problem 22P

The mineral galena is composed of lead(II) sulfide and has an average density of 7.46 g/cm3 (a) How many moles of lead(II) sulfide are in 1.00 ft3 of galena? (b) How many lead atoms are in 1.00 dm3 of galena?

                                                           Step by ste solution

Step 1  of 2

(a)

Calculate the mass of lead(II) sulfide.

Mass can be calculated by the following formula.

                                     .........................(1)

From the given,

The density of lead(II) sulfide =

Volume =

Let’s convert the cubic foot to cubic centimeters.

                                 

Substitute these values into equation (1)

                                             |

Hence, the mass of lead(II) sulfide is .

Let’s calculate the number of moles of lead (II) sulfide.

Mass of lead (II) sulfide =

Molar mass of lead(II) sulfide = 239.25 g/mol

                                 
                                                                   

Therefore, the number of moles of lead(II) sulfide is 882 mol.

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